No lol, Freddy fit in the Mk universe well because of the gore. Jason would look weird fighting Superman. Adding Rorschach on the other hand would be awesome as the Watchmen graphic novels were published by DC and the actor Jackie Earl Haley portrayed both Freddy Krueger and Rorschach in the live-action films. :b

Power girl, Braniac, Beast Boy, & Martian Manhunter were the way to go (I mean MM was already in the friggin game!!! D:). And adding Rorschach as a guest character like they did with Jackie Earl Haley's Freddy Krueger in MK9 would be awesome aswell. *sigh* It's still an awesome game i guess.